Image source: This adventure by Necrotic Gnome

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There’s information inside paragraphs that you will need to reference multiple times, even after reading it. This often corresponds to the most important information for understanding what the paragraph is about. The easier this is to see at a glance, the less time it will cost to reference during play—maintaining momentum and freeing mental capacity for creative thinking.

Hundreds of years of trial and error—and many studies—have shown that people read elements of a text in a predictable order. This order is shaped by the visual hierarchy of the elements: the larger and higher-contrast an element is, the earlier it will be read.

Therefore:

Use bold text to highlight the most important parts of a paragraph. When in doubt, highlight entities or concepts—such as the names of characters or factions, or the material composition of objects—that the paragraph is about.

Improves Usability at the Table.